Solar Panels for Your Home: The Complete UK Guide
From checking your roof to comparing quotes: plan a home solar system around the electricity you actually use.
Buying solar panels for your home means choosing a complete system, not just a panel brand. The right design balances your roof, electricity demand, budget and plans for a battery or electric vehicle. Work through the steps below before comparing installation quotes.
Before You Request a Quote
- Find your last 12 months of electricity consumption in kWh.
- Note which roof slopes receive sunlight and where trees or chimneys cast shade.
- Decide whether you want a solar-only quote and a separate battery option.
- Ask for an itemised installed price and a generation estimate for your roof.
Is Your Home Suitable for Solar Panels?
An unshaded south-facing roof is a useful starting point, but east- and west-facing roofs can also work. Ask an installer to assess the usable area, roof condition, shading and cable route. If the roof needs repairs, discuss completing them before panels are fitted.
Solar PV panels produce direct current electricity, and an inverter converts it into the alternating current your home uses. Solar generation can supply appliances while they are running; surplus electricity can be exported or stored. At night, you use the grid or a charged battery.
Roof suitability is more useful than a generic promise of savings. Start with Energy Saving Trust's solar guidance and ask each installer how your roof affects the proposed design.
How Solar Panels Reduce Your Electricity Bills
Every unit of solar electricity used at home replaces a unit you would otherwise buy. The benefit depends on your own tariff and how well your consumption matches generation. Moving suitable appliance use into daylight hours can help you use more of your output directly.
For context, Ofgem's average Direct Debit electricity unit rate for England, Scotland and Wales is 26.32p/kWh for 1 October to 31 December 2026. Your rate can differ by region, tariff and payment method. Use your bill when calculating savings, rather than treating this average as your price. See Ofgem's dated unit rates.
Export income is separate from bill savings. In Great Britain, eligible systems can join a Smart Export Guarantee tariff. Compare the supplier's current rate, certification requirements and metering terms. In Northern Ireland, ask your supplier about its export arrangements.
How Much Do Home Solar Panels Cost?
Energy Saving Trust gives an indicative installed cost of around £7,600 for a typical 4.5 kWp system. This is a starting point for budgeting, not a price for every roof. Ask for battery storage to be priced separately. See the source and cost assumptions.
Scaffolding, roof repairs, mounting arrangements, electrical work and the equipment selected can change the total. Compare quotes on the same basis using our solar panel costs guide.
| Quote item | What to ask for |
|---|---|
| Panels and layout | Model, quantity, total kWp and a drawing showing their position on your roof. |
| Inverter and electrics | Model, capacity, monitoring, protection equipment and any consumer-unit work. |
| Access and installation | Scaffolding, roof work, labour, commissioning and the total installed price. |
| Battery option | Usable capacity, charge/discharge power, warranty and the extra installed cost. |
| Performance and handover | Annual generation assumptions, certification, network paperwork and aftercare. |
How Many Solar Panels Does Your Home Need?
Size the system using your annual electricity consumption, roof layout and likely daytime usage. Bedroom count alone misses important differences: two similar houses can use very different amounts of electricity.
Panel count is not the same as system capacity. Ten 400 W panels total 4 kWp; ten 450 W panels total 4.5 kWp. That rating describes peak power, not the electricity generated over a year. Compare the installer's annual kWh estimate and the assumptions about orientation and shading.
If you plan to add an EV or heat pump, mention it during the survey. Ask how a larger array would change direct use, exports and the installed price. Our solar calculator can help you explore an initial design before the roof survey.
Which Solar Panels Should You Choose?
Compare the complete roof design before choosing a brand. A panel's dimensions and power rating affect how much capacity fits on your roof. Check the exact model's product warranty, performance warranty and the installer's route for warranty claims.
Ask why the proposed inverter and panel combination suits your property, and whether any optimisers are justified by shading. For equipment comparisons, use our solar panel buying guide. Keep the model numbers from your quote so you can compare like with like.
Should You Add a Solar Battery?
A battery is optional. It can move surplus daytime generation into the evening, but it adds cost and has charging losses. Ask for the same design with and without storage so you can see the battery's additional benefit.
- Usable capacity: how much energy you can store, not just the headline capacity.
- Power: how much it can charge or discharge at once.
- Tariff fit: how import prices, export prices and your evening demand affect the calculation.
- Aftercare: warranty terms, monitoring and what happens if a component fails.
Do not assume a battery automatically shortens payback. Compare its extra cost with its extra annual benefit, including the export income you give up when storing electricity. Our solar calculator's battery comparison shows how much each battery size changes in one worked example. Explore our home battery guide for the next stage of comparison.
Solar Panel Grants and VAT
Qualifying residential installations of energy-saving materials benefit from 0% VAT until 31 March 2027. HMRC states that the relief then returns to 5%. Ask for the VAT treatment to be clear in your installed quote; buying equipment on its own is not the same as buying a qualifying installation. Read HMRC's energy-saving materials guidance.
In England, the Warm Homes: Local Grant can fund solar panels as part of suitable home improvements. It covers eligible households in privately owned homes rated EPC D to G; income, benefits or postcode criteria apply. Use the official Warm Homes eligibility checker to find the application route for your council.
Funding differs across the UK. Use our solar grants guide to explore the options, then confirm the scheme's current requirements before committing to installation.
How to Choose a Solar Installer
Get at least three itemised quotes where practical. Give each installer the same electricity-use information and ask for the same solar-only and battery options. That makes differences in price and design easier to understand.
- Check the proposed certification and whether it meets your intended export supplier's requirements.
- Compare annual generation estimates and ask about any large differences.
- Read independent reviews, including how the company responds to faults and aftercare requests. Our Project Solar UK review shows what to check for one national installer.
- Confirm who handles the survey, installation, network paperwork and commissioning.
- Check payment stages, workmanship cover and who you contact if monitoring or equipment stops working.
Browse solar installers by area and use our installation guide to prepare questions for your survey.
Are Solar Panels Worth It? Work Out Your Savings
Separate the value of electricity you use from the value of electricity you export. The same generation total can produce different savings in two homes.
Worked Example — Not a Forecast
- Annual generation assumed: 3,500 kWh.
- Used at home: 1,500 kWh × an assumed 26p import rate = £390.
- Exported: 2,000 kWh × an assumed 10p export rate = £200.
- Combined annual benefit: £590.
- At an illustrative £7,600 installed price, simple payback is about 13 years.
The example holds prices and output constant and excludes finance, maintenance, replacement costs and degradation. Replace its assumptions with your quote, tariff and usage. Standing charges normally remain while you are connected to the grid. Ask the installer to show how the result changes if you use less electricity directly or receive a lower export rate.
A suitable system can reduce what you buy from the grid for many years. Balance that benefit against the upfront cost, the condition of your roof and how long you expect to stay in the property.
Your Next Steps
- Collect your electricity usage and explore an initial design with the solar calculator.
- Shortlist solar installers near you and request comparable quotes.
- Compare roof layouts, equipment, generation assumptions, full installed prices and aftercare.
- Choose a system based on your home's needs, not a headline savings promise.
Frequently Asked Questions
Are solar panels worth it for my home?
Start with your roof's expected generation, your electricity use and the installed price. Compare the value of electricity used at home plus export income with the cost of the system. A sunny roof and good daytime usage can improve the result; shading, finance costs and a short planned stay can make the decision less attractive.
How many solar panels do I need for my house?
Use your annual electricity consumption and available roof space, rather than bedroom count alone. Ten 400 W panels make a 4 kWp array; ten 450 W panels make 4.5 kWp. Ask each installer for a roof layout and an annual generation estimate that accounts for direction and shading.
Do I need a battery with solar panels?
No. You can use solar electricity as it is generated and export surplus power without a battery. Storage can help if you use more electricity in the evening. Compare a solar-only quote with the same system plus storage, including usable battery capacity, warranty, installation cost and expected extra savings.
How much will solar panels save each year?
Calculate the electricity you will use directly multiplied by your import unit rate, then add exported electricity multiplied by the export rate. For example, 1,500 kWh used at 26p plus 2,000 kWh exported at 10p gives £590 a year. These are illustrative assumptions, not a forecast for your home, and exclude finance, maintenance and replacement costs.
Can I sell solar electricity back to the grid?
In Great Britain, eligible installations can receive export payments through a Smart Export Guarantee tariff. Suppliers set their own rates and terms, and you need suitable export metering and the required certification. In Northern Ireland, ask your supplier about its export arrangements.
Do solar panels work on cloudy days?
Yes. Solar panels use daylight, although generation falls when light levels are lower. Compare annual generation estimates rather than a panel's peak wattage alone, and expect a different pattern of production in summer and winter.
What support is available for home solar panels?
Qualifying residential installations benefit from 0% VAT until 31 March 2027. In England, the Warm Homes: Local Grant can include solar panels for eligible households in privately owned homes with an EPC rating of D to G. Start with the official eligibility checker or your council; support elsewhere depends on the scheme and location.